Question

Given that R = 4 x + 9 y Find x when y = 1 and R = 1

Answer 1

Answer: x= -2

Step-by-step explanation:

R = 4 x + 9 y , put y = 1 and R = 1

1 = 4x+ 9×1

1= 4x+9

1-9= 4x

-8/= 4x

-8/4= x

-2= x

Answer 2

Answer:

Step-by-step explanation:

1. Write the equation. R=4x+9y
2. Subtitute values. This means to replace variables by the numbers that are known. 1=4x+9(1)
3. Simplify. Do all multiplication and addition you can. 1=4x+9
4. Isolate x. Subtract 9 from both sides to get x alone. -8=4x
5. Finish isolating x. Divide both sides by 4. -2=x
6. Check your answer. Replace the x in the original equation, if you get 1=1, it’s correct. 1=-8+9 becomes 1=1

The answer is correct!

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