1.

X+y=7 and 5x+12y=7 by substitution

Answer»

AHOY,


↪x+y=7

=> x = 7-y


↪5x+12y=7

Now, putting the VALUE of x in this equation we get,

=>5(7-y)+12y = 7

=>35-5y+12y=7

=>7y=7-35

=>7y=-28

=>y=-4


Then x=7-y

=>x=7-(-4)
=>x=7+4

=>x=11


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