Question Number 10184 by ketto last updated on 29/Jan/17

if a_− =2i+3j . b_− =19−15j and c_− =5i−7j. find the value of x such that xa_− + yc_− =b

Answered by sandy_suhendra last updated on 29/Jan/17

x(2i+3j)+y(5i−7j)=19i−15j ⇒2x+5y=19 .....(×7) ⇒14x+35y=133 ⇒3x−7y=−15 ..(×5) ⇒15x−35y=−75 −−−−−−−−−(+ 29x = 58 ⇒ x=2

Answered by chux last updated on 29/Jan/17

lets try these.....