Question

4x+y=180,-5x+3y=30 method of Cross multiplication

Answer 1

4x+y=180  ⇒A
-5x+3y=30  ⇒B

Ax3⇒   12x+3y=540
Bx1⇒    5x-3y=-30
             17x+0=510
 ⇒x=30
4x+y=180,x=30
120+y=180
y=60

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