Question

a=y-7
b=y-4
y square=100
if a>0 and b<0
then a+b=?

Answer 1

Answer:

y square = 100

so y = 10

now a=y - 7 =10-7=3

b = y-4=10-4=6

so a+b=6+3 =9

Answer 2

Concept:

First order equations include linear equations. In the coordinate system, the linear equations are defined for lines. A linear equation in one variable is one in which there is a homogeneous variable of degree 1 (i.e., only one variable). Multiple variables may be present in a linear equation. Linear equations in two variables, for example, are used when a linear equation contains two variables. For instance, 2x - 3 = 0, 2y = 8, m + 1 = 0, x/2 = 3, x + y = 2, and 3x - y + z = 3 are examples of linear equations.

Given:

a=y-7

b=y-4

y²=100

Find:

if a>0 and b<0

then a+b=?

Solution:

y² = 100

so y = 10

now,

a=y - 7 =10-7=3

b = y-4=10-4=6

so a+b=6+3 =9

Therefore , the answer is 9

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